#header {
  width: 100%;
  height: 80px;
}

#header .nav {
  max-width: 1700px;
  min-width: 1200px;
  height: 100%;
  /* background-color: aqua; */
  margin: 0 auto;
}

.nav .logo {
  width: 163px;
  height: 49px;
  margin-top: 10px;
  float: left;
}

.nav ul {
  float: right;
  margin-top: 32px;
}

.nav ul li {
  float: left;
  margin-left: 32px;
  font-family: "PingFang-SC-Regular";
  font-size: 16px;
  font-weight: normal;
  font-stretch: normal;
  letter-spacing: 0px;
  color: #000000;
}

.nav ul li a {
  color: #000000;
}

.swiper {
  width: 100%;
  height: 700px;
  background-image: url("../images/index/swiper.png");
  background-position: center center;
  background-size: cover;
  background-repeat: no-repeat;
  overflow: hidden;
}

.swiper .s_text {
  /* margin-top: 120px; */
  /* margin-left: 367px; */
  width: 1200px;
  margin: 80px auto 0;
}

.swiper .s_text_big {
  font-family: "PingFang-SC-Heavy";
  font-size: 38px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 60px;
  letter-spacing: 0px;
  color: #ffffff;
}

.swiper .s_text_small {
  font-family: "SFUIDisplay-Regular";
  font-size: 26px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  opacity: 0.9;
}

.swiper .s_btn {
  display: inline-block;
  width: 184px;
  height: 60px;
  background-color: #735ce6;
  box-shadow: 0px 10px 10px 0px rgba(45, 0, 255, 0.1);
  border-radius: 8px;
  text-align: center;
  line-height: 60px;
  color: #ffffff;
  font-size: 22px;
  margin-top: 140px;
}

.main .content {
  width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
}

.content .introduction_top {
  margin-top: 100px;
  overflow: hidden;
}

.introduction_top .city {
  width: 450px;
  height: 400px;
  float: left;
}

.id_top_l {
  width: 400px;
  margin-top: 60px;
}

.id_top_l .id_top_l_b {
  font-family: "PingFang-SC-Bold";
  font-size: 22px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 36px;
  letter-spacing: 0px;
  color: #333333;
}

.id_blue {
  display: inline-block;
  width: 50px;
  height: 6px;
  background-color: #00aaff;
  margin-bottom: 15px;
  margin-top: 15px;
}

.id_b {
  font-family: "PingFang-SC-Regular";
  font-size: 19px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #333333;
}

.introduction_bottom {
  margin-top: 177px;
}

.framework {
  width: 650px;
  height: 650px;
}

.serve {
  width: 100%;
  height: 518px;
  background-image: url("../images/index/serve_bg.png");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

.serve_content {
  width: 1200px;
  height: 100%;
  margin: 0 auto;
  overflow: hidden;
}

.serve_title {
  margin-top: 40px;
  text-align: center;
}

.title_text {
  font-family: PingFang-SC-Bold;
  font-size: 22px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 40px;
  letter-spacing: 0px;
  color: #333333;
  text-align: center;
}

.serve_box {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  padding-top: 40px;
}

.serve_box>div {
  width: 400px;
  height: 100%;
  text-align: center;
  float: left;
}

.serve_box>div>img {
  width: 140px;
  height: 140px;
}

.serve_text {
  text-align: left;
  margin: 20px auto 0;
  width: 280px;
  font-family: PingFang-SC-Regular;
  font-size: 18px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 37px;
  letter-spacing: 0px;
  color: #333333;
}

.case {
  width: 1200px;
  height: 1750px;
  margin: 0 auto;
  position: relative;
}

.case_list {
  margin: 15px auto 0;
  text-align: center;
  font-family: PingFang-SC-Regular;
  font-size: 18px;
  font-weight: normal;
  font-stretch: normal;
  letter-spacing: 0px;
  color: #00aaff;
  width: 300px;
  margin-bottom: 40px;
}

.case_list>span {
  display: inline-block;
  width: 80px;
  margin-left: 15px;
}

.case_box {
  width: 1185px;
  height: 784px;
}

.case_box>div {
  width: 384px;
  height: 384px;
  float: left;
  margin-left: 16px;
  margin-bottom: 16px;
  position: relative;
}

.case_box>div:nth-child(3n + 1) {
  margin-left: 0;
}

.case_num {
  font-family: PingFang-SC-Bold;
  font-size: 20px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  position: absolute;
  top: 62px;
  left: 40px;
}

.case_p {
  font-family: PingFang-SC-Bold;
  font-size: 30px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  position: absolute;
  top: 63px;
  left: 100px;
}

.case_to {
  font-family: PingFang-SC-Regular;
  font-size: 20px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  position: absolute;
  top: 140px;
  left: 100px;
}

.case_btn {
  display: inline-block;
  width: 280px;
  height: 60px;
  border-radius: 32px;
  border: solid 1px #00aaff;
  font-family: PingFang-SC-Regular;
  font-size: 18px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 24px;
  letter-spacing: 1px;
  color: #333333;
  text-align: center;
  line-height: 60px;
  margin-top: 96px;
  position: absolute;
  left: 460px;
}

.chart {
  width: 1188px;
  height: 50px;
  margin: 50px auto 0;
  position: relative;
}

.chart_1 {
  width: 100%;
  background-color: #00aaff;
  height: 2px;
}

.square {
  width: 24px;
  height: 24px;
  background-color: #00aaff;
  position: absolute;
  top: -11px;
}

.chart_text {
  width: 1188px;
  height: 50px;
  margin: 0 auto;
  position: relative;
}

.chart_text>span {
  display: inline-block;
  width: 160px;
  font-family: PingFang-SC-Regular;
  font-size: 20px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 24px;
  letter-spacing: 1px;
  color: #333333;
  position: absolute;
}

.footer {
  width: 100%;
  height: 220px;
  background-color: #0d0f1a;
}

.footer>ul {
  width: 800px;
  height: 180px;
  margin: 0 auto;
}

.footer>ul>li {
  float: left;
}

.footer>p {
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.li_1 {
  width: 300px;
  height: 100%;
}

.li_2 {
  width: 200px;
  height: 100%;
}

.li_3 {
  width: 200px;
  height: 100%;
}

.li_4 {
  width: 90px;
  height: 100%;
  text-align: center;
}

.p_big {
  font-family: PingFang-SC-Regular;
  font-size: 16px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 41px;
  letter-spacing: 1px;
  color: #fff;
  margin-bottom: 18px;
  margin-top: 35px;
}

.p_small {
  font-family: PingFang-SC-Regular;
  font-size: 12px;
  margin-bottom: 8px;
  color: #fff;
}

.li_4>img {
  margin-top: 35px;
  margin-bottom: 10px;
}

.nav_r {
  position: fixed;
  top: 100px;
  right: 247px;
  height: 392px;
  width: 60px;
  display: none;
  /* background-color: #fff; */
}

.nav_r>ul {
  /* height: 332px; */
  border-radius: 6px;
  box-sizing: border-box;
  background-color: #fff;
}

.nav_r>ul>li {
  width: 100%;
  height: 56px;
  float: left;
  box-sizing: border-box;
  text-align: center;
  line-height: 56px;
  font-family: PingFang-SC-Bold;
  font-size: 12px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 60px;
  letter-spacing: 0px;
  color: #cccccc;
  border-left: 1px solid #f2f2f2;
  border-right: 1px solid #f2f2f2;
  border-bottom: 1px solid #f2f2f2;
  box-sizing: border-box;
}

.nav_r>ul>li:nth-child(1) {
  border-radius: 5px 5px 0 0;
}

.nav_r>ul>li:nth-last-child(1) {
  border-radius: 0 0 5px 5px;
}

.to_top {
  width: 60px;
  height: 56px;
  border-radius: 4px;
  border: solid 1px #f2f2f2;
  box-sizing: border-box;
  margin-top: 4px;
  background-color: #fff;
  text-align: center;
  font-family: PingFang-SC-Bold;
  font-size: 12px;
  font-weight: normal;
  font-stretch: normal;
  letter-spacing: 0px;
  color: #cccccc;
}

a {
  color: #cccccc;
}